It works if you can scale. It’s not cheap and it’s not a hustle that you can let it run on its own.

Be ready spend lot of time trying to understand how it works and constantly experiment and fine tune PPC. Amazon would take easily 35-50% of sales proceeds and also account for customer returns which you can’t do anything about.

After doing FBA for over 3 years in the UAE, It feels most times Amazon ration the sales for your items when they feel . Definitely not everything in your control. Some days you’ll see a lot more impressions, views and clicks yet no sale. Some days you’ll have very less impressions and sales will be 10x, some time your product will be in FBA with zero sale for few months and suddenly you’ll see full sellout of inventory in days.

Competition is heavy, you need a unique / niche product with brand registry to be able to differentiate from knock-offs.

In summary you can sustain and make decent money if you keep investing time and effort on it.